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The vacuum command in postgres releases unused space. Be sure to also include the [postgres] tag, and version tag such as [postgresql-9.6]. Include an operating system tag,

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42
votes
5answers
41k views

Aggressive Autovacuum on PostgreSQL

I'm trying to get PostgreSQL to aggressively auto vacuum my database. I've currently configured auto vacuum as follows: autovacuum_vacuum_cost_delay = 0 #Turn off cost based vacuum ...
38
votes
3answers
34k views

Are regular VACUUM ANALYZE still recommended under 9.1?

I'm using PostgreSQL 9.1 on Ubuntu. Are scheduled VACUUM ANALYZE still recommended, or is autovacuum enough to take care of all needs? If the answer is "it depends", then: I have a largish database (...
38
votes
1answer
31k views

How to view the current settings of Autovacuum in Postgres?

I've found a million examples of how to set Autovacuum's configuration settings, but can't seem to find how to list the current configuration. Postgres 9.1 is the version I'm most interested in.
30
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4answers
27k views

I need to run VACUUM FULL with no available disk space

I have one table that is taking up close to 90% of hd space on our server. I have decided to drop a few columns to free up space. But I need to return the space to the OS. The problem, though, is ...
21
votes
1answer
26k views

VACUUM returning disk space to operating system

VACUUM usually does not return disk space to operating system, except in some special cases. From the docs: The standard form of VACUUM removes dead row versions in tables and indexes and marks the ...
19
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1answer
2k views

Is it worth it to run VACUUM on a table that only receives INSERTs?

In a 2015 re:Invent talk, AWS mentioned that vacuum should be run not only after updates or deletes but also after inserts. Here is the relevant part of the talk: http://www.youtube.com/watch?v=...
18
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4answers
28k views

How much time will a vacuum/autovacuum operation take?

I manage a big (some hundreds of gigs) database containing tables with various roles, some of them holding millions of records. Some tables only receive large number of inserts and deletes, some other ...
18
votes
3answers
21k views

VACUUM FREEZE vs. VACUUM FULL

Can someone explain the difference between these types of VACUUM in PostgreSQL? I read the doc but it just says that FULL locks the tables and FREEZE "freezes" the tuples. I think that's the same. Am ...
15
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4answers
27k views

Should I manually VACUUM my PostgreSQL database if autovacuum is turned on?

I use software which makes a big PostgreSQL database (there is a table with a million rows in it) and the developers says I should VACUUM and ANALYZE periodically. But the PostgreSQL database default ...
13
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2answers
11k views

PostgreSQL difference between VACUUM FULL and CLUSTER

I have a table with 200 GB of size occupied by data and 180 GB of size by the 6 indexes on it. It is 30% bloated, so I want to reclaim unwanted space occupied by it. It is clustered on job_id_idx ...
13
votes
1answer
640 views

Disk file effects of delete and vacuum

I have a very frequently updated table with 240 million rows (and growing). Every three hours 1.5 million rows are inserted and 1.5 million are deleted. When I moved the cluster to a SSD this bulk ...
11
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1answer
2k views

Busy table is not getting vacuumed

We're using Postgres 9.2 on Windows to store low-frequency timeseries data: we're inserting around 2000 rows per second every second 24 hours, 7 days a week with no downtime. There is a DELETE that ...
10
votes
2answers
2k views

What fillfactor for caching table?

I have heavily updated / accessed table where I store serialized java objects. They are in the table for 2-3 hours (also are being updated during that period) and then removed. Size of table is around ...
10
votes
1answer
10k views

Does cancelling an (AUTO)VACUUM process in PostgreSQL make all the work done useless?

In some occasions, and after making a massive update, insert or delete from a table, I have started a VACUUM FULL ANALYZE to make sure the DB was not getting too bloated. Doing it in a production ...
9
votes
1answer
3k views

Reclaim disk space from dropped column without downtime

I have a heavily used table (with around 5 million rows) in a PostgreSQL database in which I want to drop a column and reclaim the space the column used. The docs suggest doing a table rewriting ...
9
votes
2answers
564 views

Does SELECT remove dead rows like VACUUM does?

I was fiddling with VACUUM and noticed some unexpected behavior where SELECTing rows from a table seems to reduce the work VACUUM has to do afterwards. Test Data Note: autovacuum is disabled CREATE ...
9
votes
1answer
378 views

How to reclaim space taken by an index that partially built and was terminated by a power outage

I'm running postgres (postgis) 9.4.2 on a mac (10.10.4). I've got a couple big tables (several TBs). During an index build on one of them that takes about a week, I watched the available HD space ...
8
votes
2answers
12k views

Why wouldn't VACUUM ANALYZE clear all dead tuples?

We run a "manual" VACUUM ANALYZE VERBOSE on some of our larger tables after we do major DELETE/INSERT changes to them. This seems to work without issue although sometimes a table's VACUUM job will run ...
8
votes
1answer
3k views

Does VACUUM FULL need ANALYZE

I'd be grateful for some insight into the VACUUM functionality within PostgreSQL 9.3. I read through the documentation and searched around a bit but could not find a definitive answer to this. I'm ...
7
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3answers
5k views

VACUUM VERBOSE outputs, nonremovable “dead row versions cannot be removed yet”?

I have a Postgres 9.2 DB where a certain table has lots of nonremovable dead rows: # SELECT * FROM public.pgstattuple('mytable'); table_len | tuple_count | tuple_len | tuple_percent | ...
6
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1answer
5k views

PostgeSQL 9.3: Is it safe to stop VACUUM FULL?

I'm using PostgreSQL 9.3 on RDS. Once in a while, I run a VACUUM FULL operation on the database. However, such operation can take quite a while and it blocks other tables, so the need to stop the ...
6
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1answer
3k views

PostgreSQL strategies to deal with disk filling up

I'm using PostgreSQL (8.4) to store data produced by an application making frequent inserts (in the table structure described below). The database keeps growing with time and, since the newer data is ...
5
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1answer
989 views

For alignment optimized table is bigger than original table - why?

In another question I learned that I should optimize the layout from one of my tables to save space and have better performance. I did this, but ended up with a larger table than before and ...
4
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2answers
2k views

PostgreSQL unexplained table bloat

I have a table in a Postgres 8.2.15 database. The table bloated to almost 25GB but after running vacuum full and cluster the table size was dramatically smaller, well under 1GB. A few weeks later ...
4
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1answer
1k views

Does postgres efficiently re-use space from deleted rows?

From the docs: In PostgreSQL, an UPDATE or DELETE of a row does not immediately remove the old version of the row [...] But eventually, an outdated or deleted row version is no longer of interest ...
4
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3answers
3k views

How to reclaim disk space after delete without rebuilding table?

Our PostgreSQL 9.0 Windows production server is running low on space. In our 100GB database, we have a large table containing TOASTed binary data. We have deleted some rows and need to return the ...
4
votes
1answer
4k views

VACUUM FULL fails with 'ERROR: Check free disk space'

I am using Postgres 9.4. I have a database that \l+ tells me is 164 GB. When I try to run VACUUM FULL on the database, I get this error (after many hours): ERROR: could not extend file "base/18222/...
4
votes
1answer
2k views

PostgreSQL maintenance

I am new to PostgreSQL and want to know more about maintenance options in pgAdmin III. I've read the documentation and now I know that vacuuming frees some space and I need to run it regularly. ...
4
votes
1answer
364 views

How do databases deal with file system fragmentation?

Especially analytic databases that try to optimize for queries that scan large portions of tables instead of randomly accessing specific rows. For example Redshift has a concept of a sort key that, ...
3
votes
1answer
594 views

Are autovacuum VACUUMs slower than a manual VACUUM?

I have a few large tables that take days to autovacuum, sometimes resulting in poor performance until the vacuum finishes. Most of the recommendations I've seen mention doing a manual VACUUM during ...
3
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2answers
3k views

Vacuum vs Auto Vacuum

I am trying to find answers for my below few queries which will help me in fine tuning my postgres DB. I did some googling but was not able to find answer. 1) Out of vacuum or Auto vacuum which is ...
3
votes
2answers
2k views

How to `vacuumlo` an RDS PostgreSQL database?

As you may have noticed, as a fully managed data base as a service product, AWS Relational Data base Service (RDS) restricts the execution of userland commands. I was staging a production database, ...
3
votes
1answer
3k views

Is VACUUM FULL necessary on a DROP TABLE / TRUNCATE approach for a datawarehouse

We are updating a datawarehouse on a weekly basis using a series of TRUNCATE source_table1 COPY source_table1 FROM [...] ... for data import and: DROP TABLE IF EXISTS my_table CREATE TABLE ...
3
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0answers
424 views

AWS Aurora Database Corruption

I'm running Aurora Postgres and noticed that metric Maximum Used Transaction IDs is increasing a lot. Trying to manually vacuum the tables that's was not automatically vacuumed lead me to the ...
3
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0answers
490 views

Stubborn autovacuum process slow things dows

We are facing a strange problem since yesterday. In a database of ours there is a partitioned table containing historical data. That is, every week's data goes to a different partition and stays ...
2
votes
2answers
649 views

pg_relation_size does not show any difference after VACUUM ANALYZE

I wrote a script to backup a postgresql using COPY and then delete those records. I have used pg_relation_size before and after delete. pg_relation_size DELETE VACUUM ANALYZE pg_relation_size But ...
2
votes
1answer
2k views

“Truncate” or “Delete/Vacuum Full” for deleting some of the table rows

I have a db which has 223 tables and I have to delete some of the records from 10 of them, each has apprx. 1.5million records. Those tables are storing the temperatures every 7seconds. We have decided ...
2
votes
1answer
2k views

Dropping indexes doesn't seem to release space to the OS. Can it?

I'm running PostgreSQL 9.1. I have noticed really alarmingly bad indexes are taking up a lot of space on my server, e.g: evlampts=# SELECT pg_size_pretty(pg_relation_size('mcdata_2011_07')) AS ...
2
votes
2answers
681 views

How to optimize a table for a very high-frequency updates?

I have a table that contains a list of tasks that need to be run periodically: applaudience=> \d+ maintenance_task Table "...
2
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3answers
2k views

Vacuum settings for mostly append-only data

I have a table with the following characteristics: We INSERT a few 100k rows each day We never UPDATE the rows We DELETE "old" data once a week From my shallow knowledge of Postgres VACUUM, it seems ...
2
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1answer
1k views

Time taken by VACUUM FULL to reclaim space

After receiving some insightful guidance in a previous post here, I'm going to run VACUUM FULL on 4 PostgreSQL 9.3.10 tables. Table sizes are: 1) links_publicreply: ~30M rows, 9 columns, 3 indexes (...
2
votes
1answer
1k views

Is it safe to kill vacuumdb?

I would like to schedule a vacuumdb cron job for an entire database, but I don't want it to run past a certain time. Is it safe to just stop the job with killall vacuumdb?
2
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1answer
164 views

Does AWS ever `vacuumlo` PostgreSQL RDS instances?

Link to the long story happened before (and reason to have) this question. Does AWS ever vacuumlo PostgreSQL RDS instances?
2
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1answer
81 views

Is postgres vacuum secure

Postgres delete doesn't actually remove the record from the table file. Once the delete is committed and the last transaction is closed, no postgres process can see the record any more, the deleted ...
2
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1answer
861 views

Autovacuum is not running or working

We're currently using Postgres 9.4.14 hosting Zabbix 2.4 database. For a while now, the following message started to happens: < 2017-11-23 15:15:20.037 -03 >HINT: Close open transactions soon ...
2
votes
1answer
447 views

delete hung soon after vacuum verbose analyse

I have a fairly large java webapp system that connects to a postgres8.4 db on rhel. This app only does inserts and reads. This has been running without issue for 2.5 years and for the last year or so ...
2
votes
4answers
3k views

postgresql cannot drop a table when autovacuum holds lock on it

Autovacuuming process holds RowExclusiveLock and ShareUpdateExclusiveLock on the table, which I want to drop. I read that autovacuum should be canceled automatically, when submitting DROP TABLE ...
2
votes
1answer
305 views

How do we get around PostgreSQL autovacuum taking a table-level lock ACCESS EXCLUSIVE on replicas?

We are running: user@primary/client-n:~$ psql -d database -c "SELECT version();" version --------------------------------------------...
2
votes
0answers
123 views

How do I fix multixact wraparound after it has already occurred?

I have a database which has a single table for which MultiXact wraparound has already occurred. Neither manual vacuums nor automatic vacuums are able to fix this condition. Manual vacuums fail almost ...
2
votes
0answers
392 views

Does VACUUM FULL ANALYZE a partition locks the main table in postgresql?

I'm using postgresql 9.5 and partman for partitioning tables. there is this table that has 30 partitions and volume of one of them are too higher than others. so I need to full vacuum this partition ...

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